Diagnose faults in heavy goods and public service vehicles where no prescribed process or format is available

This standard is about devising and implementing strategies to diagnose faults on heavy goods and public service vehicles when the application of standard manufacturer diagnostic procedures has failed to reveal the source and cause of problems.  You are also required to identify the best course of action to be taken to correct problems.

P8.1 your workplace procedures

P8.2 health, safety and environmental requirements

P9 work in a way which minimises the risk of:

P9.1 damage to other vehicle systems, units and components

P9.2 contact with leakages and hazardous substances

P9.3 damage to your working environment

P9.4 injury to self and others

P10 use any equipment required, correctly and safely throughout all diagnostic and rectification activities

P11 collect sufficient diagnostic information to enable an accurate diagnosis of the fault 

P12 correctly identify the cause(s) of the fault

P13 identify and record any system deviation from acceptable limits 

P14 ensure your assessment of dismantled sub-assemblies, units and components identifies their condition and suitability for repair or replacement

P15 make clear recommendations for a suitable course of action to rectify the fault

P16 promptly inform the relevant person(s) where repairs are uneconomic or unsatisfactory to perform

P17 complete all system checks and tests in the most cost and time effective way for the fault presented

P18 complete all system diagnostic activities within the agreed timescale

P19 ensure your records are accurate, complete and passed to the relevant person(s) within the agreed timescale in the format required

P20 promptly report any anticipated delays in completion to the relevant person(s)

K1.1 health and safety

K1.2 the environment (including waste disposal)

K1.3 appropriate personal and vehicle protective equipment

K2 the legal requirements relating to the vehicle (including road safety requirements)

K3 the implications on an Operators Licence of not carrying out repairs correctly

K4 how to formulate and construct your own diagnostic procedures and processes in order for diagnostic activities to proceed

K5 the importance of documenting diagnostic and rectification information following your workplace procedure

K6 the importance of working to agreed timescales and keeping others informed of progress

K7 the relationship between time, costs and productivity

K8 your workplace procedure for the referral of problems

K9 the importance of promptly reporting anticipated delays to the relevant person(s) following your workplace procedure

Electrical and electronic systems

K10 the hazards associated with working on or near high voltage electrical vehicle components

K11 electrical and electronic systems including types of sensors and actuators, their application and operation

K12 how electrical and electronic vehicle systems operate, including electrical component function, electrical inputs, outputs, voltages and oscilloscope patterns, digital and fibre optics systems

K13 the interaction between electrical, electronic, mechanical, pneumatic and hydraulic components within a vehicle

K14 how mechanical, hydraulic and electrical systems interlink and interact, including multiplexing

K15 electrical symbols, units and terms

K16 electrical safety procedures 

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Use of diagnostic and rectification equipment

K17 how to prepare and check the accuracy of *diagnostic testing equipment

K18 how to use diagnostic and rectification equipment for mechanical, electrical, electronic, pneumatic, hydraulic and fluid systems, specialist repair tools and general workshop equipment

Vehicle system faults, their diagnosis and correction

K19 how vehicle mechanical, electrical, electronic, pneumatic, hydraulic and fluid systems are constructed, dismantled, reassembled and operate

K20 the types and causes of vehicle mechanical, electrical, electronic, pneumatic, hydraulic and fluid system, component and unit faults and failures

K21 vehicle mechanical, electrical, electronic, pneumatic, hydraulic and fluid component and unit replacement procedures, the circumstances which will necessitate replacement and other possible courses of action

K22 how to find, interpret and use sources of information on vehicle mechanical, electrical, electronic, pneumatic, hydraulic and fluid system specifications, diagnostic test procedures, repair procedures and legal requirements 

K23 vehicle operating specifications for limits, fits and tolerances relating to vehicle mechanical, electrical, electronic, pneumatic, hydraulic and fluid systems for the types of vehicle on which you work

K24 how to select the most appropriate diagnostic testing method for the symptoms presented

K25 how to carry out systematic diagnostic testing of vehicle mechanical, electrical, electronic, pneumatic, hydraulic and fluid systems

K26 how to assess the condition of the systems and components within vehicle mechanical, electrical, electronic, pneumatic, hydraulic and fluid systems

K27 how to interpret, evaluate and analyse test results and vehicle data in order to identify the location and cause of vehicle system faults

K28 how to carry out the rectification activities in order to correct faults in the vehicle mechanical, electrical, electronic, pneumatic, hydraulic and fluid systems

K29 your workplace procedure and policy for:

K29.1 work carried out under warranty

K29.2 liaising with manufacturers and outside agencies

K30 the relationship between test methodology and the faults repaired – the use of appropriate testing methods

K31 how to make cost effective recommendations for rectification

K32 the importance of inspecting the vehicle following any repairs

1.1. mechanical

1.2. electrical

1.3. electronic

1.4. hydraulic

1.5. pneumatic

2. Faults cover the:

2.1. vehicle engine area

2.2. transmission and driveline area

2.3. chassis system area

2.4. electrical and electronic units and components area

3. Diagnostic methods are:

3.1. sensory

3.2. functional 

3.3. measurement

3.4. electrical and electronic systems testing

4. *Diagnostic testing *is defined as:

4.1. verify the fault

4.2. collect further information

4.3. evaluate the evidence

4.4. carry out further tests in a logical sequence

4.5. rectify the problem

4.6. check all systems

5. Equipment is:

5.1. diagnostic and rectification equipment for mechanical systems

5.2. diagnostic and rectification equipment for electrical and electronic systems

5.3. diagnostic and rectification equipment for hydraulic and fluid systems

5.4. diagnostic and rectification equipment for pneumatic systems

5.5. specialist repair tools

5.6. general workshop equipment​